pub struct Json<T>(pub T);Expand description
JSON Extractor / Response.
When used as an extractor, it can deserialize request bodies into some type that
implements [serde::de::DeserializeOwned]. The request will be rejected (and a JsonRejection will
be returned) if:
- The request doesn’t have a
Content-Type: application/json(or similar) header. - The body doesn’t contain syntactically valid JSON.
- The body contains syntactically valid JSON, but it couldn’t be deserialized into the target type.
- Buffering the request body fails.
⚠️ Since parsing JSON requires consuming the request body, the Json extractor must be
last if there are multiple extractors in a handler.
See “the order of extractors”
See JsonRejection for more details.
§Extractor example
use axum::{
extract,
routing::post,
Router,
};
use serde::Deserialize;
#[derive(Deserialize)]
struct CreateUser {
email: String,
password: String,
}
async fn create_user(extract::Json(payload): extract::Json<CreateUser>) {
// payload is a `CreateUser`
}
let app = Router::new().route("/users", post(create_user));When used as a response, it can serialize any type that implements [serde::Serialize] to
JSON, and will automatically set Content-Type: application/json header.
If the Serialize implementation decides to fail
or if a map with non-string keys is used,
a 500 response will be issued
whose body is the error message in UTF-8.
§Response example
use axum::{
extract::Path,
routing::get,
Router,
Json,
};
use serde::Serialize;
use uuid::Uuid;
#[derive(Serialize)]
struct User {
id: Uuid,
username: String,
}
async fn get_user(Path(user_id) : Path<Uuid>) -> Json<User> {
let user = find_user(user_id).await;
Json(user)
}
async fn find_user(user_id: Uuid) -> User {
// ...
}
let app = Router::new().route("/users/{id}", get(get_user));Tuple Fields§
§0: TImplementations§
Source§impl<T> Json<T>where
T: DeserializeOwned,
impl<T> Json<T>where
T: DeserializeOwned,
Sourcepub fn from_bytes(bytes: &[u8]) -> Result<Json<T>, JsonRejection>
pub fn from_bytes(bytes: &[u8]) -> Result<Json<T>, JsonRejection>
Construct a Json<T> from a byte slice. Most users should prefer to use the FromRequest impl
but special cases may require first extracting a Request into Bytes then optionally
constructing a Json<T>.
Trait Implementations§
impl<T> Copy for Json<T>where
T: Copy,
Source§impl<T, S> FromRequest<S> for Json<T>
impl<T, S> FromRequest<S> for Json<T>
Source§type Rejection = JsonRejection
type Rejection = JsonRejection
Source§impl<T> IntoResponse for Json<T>where
T: Serialize,
impl<T> IntoResponse for Json<T>where
T: Serialize,
Source§fn into_response(self) -> Response<Body>
fn into_response(self) -> Response<Body>
Source§impl<T, S> OptionalFromRequest<S> for Json<T>
impl<T, S> OptionalFromRequest<S> for Json<T>
Auto Trait Implementations§
impl<T> Freeze for Json<T>where
T: Freeze,
impl<T> RefUnwindSafe for Json<T>where
T: RefUnwindSafe,
impl<T> Send for Json<T>where
T: Send,
impl<T> Sync for Json<T>where
T: Sync,
impl<T> Unpin for Json<T>where
T: Unpin,
impl<T> UnsafeUnpin for Json<T>where
T: UnsafeUnpin,
impl<T> UnwindSafe for Json<T>where
T: UnwindSafe,
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T: ?Sized,
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T: ?Sized,
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fn borrow_mut(&mut self) -> &mut T
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impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> Formattable for T
Source§impl<T, S> Handler<IntoResponseHandler, S> for T
impl<T, S> Handler<IntoResponseHandler, S> for T
Source§fn call(
self,
_req: Request<Body>,
_state: S,
) -> <T as Handler<IntoResponseHandler, S>>::Future
fn call( self, _req: Request<Body>, _state: S, ) -> <T as Handler<IntoResponseHandler, S>>::Future
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